JP6004020B2 - Sealed battery and manufacturing method thereof - Google Patents

Description

  The present invention provides a sealed battery such as a non-aqueous electrolyte secondary battery or a nickel-hydrogen secondary battery.

  There are many nonaqueous electrolyte secondary batteries typified by alkaline batteries and lithium ion batteries typified by nickel metal hydride batteries as drive power sources for portable electronic devices such as cellular phones, portable personal computers, and portable music players. It is used. Furthermore, due to the stricter regulations on the emission of carbon dioxide gas, etc., against the backdrop of the growing environmental protection movement, the automobile industry has not only used fossil fuels such as gasoline, diesel oil, and natural gas, but also electric vehicles ( EV) and hybrid electric vehicles (HEV) are being actively developed. In addition, the rapid rise in fossil fuel prices in recent years is a tailwind for the development of these EVs and HEVs.

  In such EV and HEV applications, since high output characteristics are required, each battery is increased in size, and a large number of batteries are connected in series or in parallel. In particular, sealed batteries used in such applications use extremely highly reactive materials, especially in non-aqueous electrolyte secondary batteries, so they are much safer than batteries used in small devices. Is required. Therefore, in sealed batteries used for EV and HEV applications, as shown in Patent Documents 1 and 2 below, a gas discharge valve is provided to release the internal pressure when the pressure in the battery outer can increases, A current interrupting mechanism for interrupting electrical connection between the external terminal and the electrode body inside the outer can is provided.

  That is, the following Patent Document 1 includes an external terminal 53 provided with a through hole 52 that communicates the current interrupt mechanism 51 and the outer space of the sealed battery 50 as shown in FIG. An invention of a sealed battery 50 is disclosed in which the current interrupting mechanism 51 is reliably operated when the pressure in 54 increases. In addition, as shown in FIG. 6B, the following Patent Document 2 includes an external terminal 63 provided with a through-hole 62 that communicates the current interrupt mechanism 61 and the outer space of the sealed battery 60, The current interruption mechanism 61 is activated when the pressure increases, and the through hole 62 is made of resin in order to prevent moisture and oxygen from entering the through hole 62 and degrading the current interruption mechanism 61. An invention of a sealed battery sealed with a membrane plug 65 is disclosed.

JP 2008-66254 A JP 2008-66255 A

The through-holes of the sealed battery disclosed in Patent Documents 1 and 2 both increase the pressure in the outer can because the space on the side corresponding to the outside of the battery of the current interrupting mechanism communicates with the outside of the battery. This is provided to facilitate the operation of the current interruption mechanism. Therefore, it is said that the resin membrane plug 65 used in the sealed battery 60 disclosed in the above cited document 2 needs to be thin, and it has not been considered to be a strong plug. Therefore, in the sealed battery 60 disclosed in the above cited reference 2, there is a possibility that the membrane plug 65 may be damaged if any impact is applied from the outside, and when the membrane plug 65 is damaged, As shown in the cited document 1, there is a possibility that the current interrupting mechanism 61 may be deteriorated when moisture, oxygen, or the like enters from the outside.

  However, according to experiments by the inventors, the current interruption mechanism does not substantially differ in operation regardless of whether the space on the side corresponding to the outside of the battery of the current interruption mechanism is sealed or opened. It was found. That is, even if the pressure in the outer can increases due to some cause, the gas pressure generated inside the battery at the time of abnormality is very large, so the pressure in the sealed space on the side corresponding to the outside of the battery of the current interruption mechanism is This is because there is almost no increase at the same time, and there is no problem even if the space on the side corresponding to the outside of the battery of the current interruption mechanism is sealed.

  The present invention has been made on the basis of the experimental results as described above, and has a highly reliable sealed battery including a connection terminal having a configuration in which an electrolytic solution or a cleaning solution is difficult to enter the current interrupting mechanism at the time of manufacture. An object is to provide a manufacturing method.

In order to achieve the above object, the sealed battery of the first invention is:
An outer can having an opening;
An electrode body having a positive electrode plate and a negative electrode plate each provided with a positive electrode current collector plate and a negative electrode current collector plate housed in the outer can;
A sealing plate sealing the opening of the outer can;
An external terminal having a connection terminal attached to the sealing plate;
A sealed battery comprising:
The connection terminal and the electrode body are electrically connected,
A current interrupting mechanism for interrupting current corresponding to a rise in pressure inside the outer can is provided between conductive paths that electrically connect the connection terminal and the electrode body,
The connection terminal has a through hole formed in a space corresponding to the outer side of the battery of the current interrupt mechanism.
The through hole is sealed by a terminal plug made of an elastic member and a metal plate so that a sealed space is formed between the current interrupt mechanism and the metal plate is welded to the connection terminal. It is characterized by that.

The through hole formed in the connection terminal is used to conduct a leakage inspection of the current interrupt mechanism during assembly. However, the electrolyte and cleaning water can enter the through hole of the connection terminal when injecting or cleaning the electrolyte. It may get infiltrated. If electrolyte or cleaning water enters the through-hole, the current interrupt mechanism will be corroded, which may cause malfunction. According to the sealed battery of the first invention, the through hole is sealed by the terminal plug made of an elastic member, and the space between the through hole and the current interrupting mechanism is a sealed space. Since the electrolytic solution and cleaning water do not enter the hole, the current interrupt mechanism is not corroded to cause malfunction, and a highly reliable sealed battery can be obtained.
Furthermore, since the terminal plug is made of an elastic member and a metal plate, and this metal plate is welded to the connection terminal by laser welding or the like, the through hole can be sealed more firmly. . The size of the metal plate is preferably the same as or slightly larger than the head diameter of the terminal plug.

In the sealed battery of the first invention, the through hole of the connection terminal is firmly sealed by the terminal plug made of an elastic member, but the space between the side corresponding to the battery outer side of the current interruption mechanism and the terminal plug A sealed space is formed between them, and the gas pressure generated inside the battery at the time of abnormality becomes very large, so that the operation of the current interrupting mechanism is not adversely affected. The sealed battery of the first invention is for an aqueous electrolyte secondary battery using an aqueous electrolyte such as a nickel-hydrogen secondary battery, even if the electrode body is for a non-aqueous electrolyte secondary battery. In addition, even if the electrode body is a wound electrode body wound with a separator sandwiched between a positive electrode plate and a negative electrode plate, or a laminated electrode body laminated Both are applicable.

  Further, in the sealed battery of the first invention, the through hole formed in the connection terminal has a large diameter portion formed on the outer side of the outer can and a small diameter portion formed on the inner side of the outer can, The terminal plug has a head having a larger diameter at the upper end than the small diameter portion of the through hole and a smaller diameter than the large diameter portion of the through hole, and a lower end having a smaller diameter than the head and the small diameter portion of the through hole. A projecting portion having a larger diameter than the projecting portion, a locking portion formed so as to taper from the projecting portion, and the length of the small diameter portion of the through hole having substantially the same diameter as the small diameter portion of the through hole in the middle. The coupling portion having substantially the same length, the head portion is positioned on the large diameter portion side of the through hole, and the penetration portion protrudes from an end portion of the small diameter portion of the through hole. It is preferable that it is attached to the hole (second invention).

  The through hole formed in the connection terminal in the sealed battery of the second invention has a large-diameter portion formed on the outer side of the outer can and a small-diameter portion formed on the inner side of the outer can, and has a T-shaped cross section. It has become. The terminal plug used in the sealed battery of the second invention is a head having a diameter larger than the small diameter portion of the through hole formed in the connection terminal at the upper end portion and smaller than the large diameter portion of the through hole. A protrusion at the lower end that is smaller in diameter than the head and larger in diameter than the small diameter portion of the through hole, and a locking portion that is tapered so as to taper from the protrusion, and a small diameter of the through hole in the middle And a connecting portion having substantially the same diameter as the portion and substantially the same length as the small diameter portion of the through hole. Therefore, when this terminal plug is inserted into the through hole formed in the connection terminal from the locking portion side, the terminal plug is formed of an elastic member, so that the protruding portion is deformed and passes through the small diameter portion of the through hole. It protrudes from the small diameter part of the hole and returns to its original shape, and at the same time, the terminal plug and the head are caught by the small diameter part of the through hole and fit within the large diameter part of the through hole. Therefore, according to the sealed battery of the second invention, since the terminal plug is firmly fixed to the connection terminal, the electrolytic solution and the cleaning water do not enter more into the through hole.

  In the sealed battery of the first invention, the current interrupting mechanism is deformed in response to an increase in pressure inside the outer can, and interrupts the electrical connection between the connection terminal and the electrode body. It is preferable that it is (3rd invention).

  In the sealed battery of the third invention, since a space is formed between the current interrupting mechanism and the terminal plug, when the current interrupting mechanism is deformed in response to an increase in pressure inside the outer can, Will not be disturbed. Therefore, according to the sealed battery of the third invention, when the pressure inside the outer can rises, the current interrupting mechanism is reliably deformed and the electrical connection between the connection terminal and the electrode body is reliably interrupted. Will be able to. The current interrupting mechanism includes a metal plate that is sealed so that a predetermined space is formed between the through hole of the connection terminal, and a metal plate that is welded to the metal plate and annularly thin so as to surround the welded portion. Using a current collector with a groove or a metal foil welded to the current collector around this weld, and when the pressure inside the outer can increases and the metal plate deforms, the current collector becomes annular It is possible to employ a structure in which the thin groove portion formed in the rupture or the metal foil is ruptured. In this case, the space between the through hole of the connection terminal and the current blocking mechanism need not be communicated with the outside, and may be a sealed space.

Furthermore, in order to achieve the above object, a method for producing a sealed battery according to the fourth invention comprises:
An outer can having an opening, an electrode body having a positive electrode plate and a negative electrode plate, a positive current collector plate and a negative current collector plate respectively attached to the positive electrode plate and the negative electrode plate, and a through hole was formed. In a manufacturing method of a sealed battery comprising an external terminal provided with a connection terminal and a sealing plate having an electrolyte injection port,
A first step of attaching the connection terminal to the sealing plate;
A second step of attaching a current interruption mechanism to the connection terminal so as to seal one end of the through hole;
A third step of inspecting air leakage between the connection terminal and the current interrupt mechanism by sending gas from the other end of the through hole;
A fourth step of fixing a positive current collector or a negative current collector of the electrode body to the current interrupt mechanism;
A fifth step of welding and fixing the metal plate to the connection terminal after inserting a terminal plug made of an elastic member and a metal plate into the through hole;
Welding the positive electrode current collector and the negative electrode current collector to the electrode body, inserting the electrode body into an outer can, and sealing the sealing plate to the opening of the outer can;
A seventh step of sealing the electrolytic solution injection port after injecting the electrolytic solution from the electrolytic solution injection port;
It is characterized by providing.

In the method for manufacturing a sealed battery according to the fourth aspect of the invention, since the air leakage between the connection terminal and the current interrupting mechanism is inspected in the third step, a poorly welded battery can be selected during assembly. In addition, since the terminal plug made of an elastic member is inserted into the through hole in the fifth step, the inside of the through hole is injected at the time of electrolyte injection in the seventh step and then washed with water as necessary. It is possible to prevent the electrolytic solution from entering. Therefore, according to the method for manufacturing a sealed battery of the fourth aspect of the invention, defective products are selected on the way, and the current interruption mechanism is not corroded to cause a malfunction. Can be manufactured. As the gas used when inspecting air leakage, nitrogen (N ₂₎ an inert gas such as a gas, it is possible to use dry air and the like.

Moreover, in the manufacturing method of the sealed battery of 4th invention, in the said 5th process, what consists of an elastic member and a metal plate is used as said terminal plug, and the terminal plug which consists of an elastic member is inserted in the said through-hole. Then, the metal plate is welded and fixed to the connection terminal.
Since the terminal plug is made of an elastic member, it may fall off due to vibration or the like. In the sealed battery manufacturing method of the present invention, the terminal plug is made of an elastic member and a metal plate, and the metal plate is welded and fixed to the connection terminal, so that the through hole is sealed more firmly. You can stop. When the metal plate is welded and fixed, laser welding can be used to facilitate welding.

In the method for manufacturing a sealed battery according to a fourth aspect of the present invention, gas is again fed from the other end of the through hole between the fourth step and the fifth step, and the connection terminal and the It is preferable to include an eighth step of inspecting air leakage with the current interrupt mechanism (fifth invention).
According to the sealed battery of the fifth invention, after the air leakage between the connection terminal and the current interruption mechanism is inspected in the third step, the air between the connection terminal and the current interruption mechanism is again in the eighth step. Since leakage is inspected, it is possible to more accurately select batteries with poor welding during the assembly process, and thus it is possible to manufacture a highly reliable sealed battery.

1 is a perspective view of a sealed battery according to an embodiment of the present invention. It is a disassembled perspective view of the external terminal of the sealed battery shown in FIG. It is sectional drawing of the external terminal of the sealed battery shown in FIG. It is sectional drawing of the terminal plug of embodiment of this invention. It is sectional drawing which shows order for the assembly process of the external terminal of the sealed battery of embodiment of this invention later on. 6A is a cross-sectional view of an external terminal of a sealed battery according to a conventional example, and FIG. 6B is a cross-sectional view of an external terminal of a sealed battery according to another conventional example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. Hereinafter, a positive external terminal on the positive electrode plate side will be described as an example. As shown in FIGS. 1 and 2, the sealed battery 10 of the present embodiment includes a wound electrode body 12 in which a positive electrode plate and a negative electrode plate are wound and flattened in an outer can 11. The outer can 11 is stored sideways with respect to the axial direction of the can, and the opening of the outer can 11 is sealed by the sealing plate 13. Further, the sealing plate 13 is provided with a gas discharge valve 14, an electrolyte injection hole (not shown), and its sealing material 15. The gas discharge valve 14 is opened when a gas pressure higher than the operating pressure of the current interrupt mechanism is applied.

  Further, a positive electrode external terminal 16 and a negative electrode external terminal 17 are formed on the sealing plate 13 outside the sealed battery 10. The positive external terminal 16 and the negative external terminal 17 are appropriately shaped terminal plates, external connection terminals, etc. (not shown) depending on whether the sealed battery is used alone, or in series connection or parallel connection. Used with attached. Hereinafter, the configuration of the positive electrode external terminal 16 for the positive electrode plate will be described.

As shown in FIGS. 2 and 3, a current collecting tab 21 is connected to, for example, a plurality of positive electrode cores 20 protruding from one end face of the wound electrode body 12. A current collector 22 extends from the current collecting tab 21. The connection terminal 23 includes a cylindrical portion 23a, and a through hole 23b is formed therein. And the cylinder part 23a of the connection terminal 23 is inserted in the hole respectively formed in the gasket 24, the sealing board 13, the insulating board 25, and the sealing body tab 26, and the front-end | tip part 23c is crimped and it fixes integrally. .

  Further, the periphery of the reversing plate 27 is welded to the tip of the sealing body tab 26, and the current collector 22 is welded to the central portion of the reversing plate 27 by laser welding. A resin current collector holder 28 for positioning the current collector 22 and the reversing plate 27 and electrically insulating the peripheral portion is disposed around the current collector 22 and the reversing plate 27. Therefore, the positive electrode core 20 is electrically connected to the connection terminal 23 via the current collecting tab 21, the current collector 22, the reversing plate 27, and the sealing body tab 26. Further, the positive external terminal 16 of the present embodiment is formed by the connection terminal 23, the gasket 24, the sealing plate 13, the insulating plate 25, the sealing body tab 26, the reversing plate 27, the current collector holder 28, and the current collector 22. ing.

  Here, the reversing plate 27 and the current collector 22 form the current interruption mechanism 18 of the present invention. That is, the current collector 22 is formed with an annular groove 22a around the laser welding location, and an annularly thin portion is formed. The reversing plate 27 swells to the through hole 23b side of the connection terminal 23 when the pressure in the outer can 11 increases, and the current collector 22 is welded to the center of the reversing plate 27. When the pressure in the can 11 exceeds a predetermined value, the current collector 22 is broken at the annular groove 22a, so that the electrical connection between the reversing plate 27 and the current collector 22 is interrupted. Yes. As the current interrupting mechanism 18, in addition to the above-described configuration, a member made of a metal foil welded to the reversing plate 27 and welded to the current collector around the welded portion is used. A structure in which the metal foil breaks when the pressure increases and the reversal plate 27 is deformed can also be employed.

  The through hole 23 b formed in the connection terminal 23 has a large diameter portion 23 d formed on the outer side of the outer can 11 and a small diameter portion 23 e formed on the inner side of the outer can 11. A rubber terminal plug 30 is firmly sealed in the through hole 23b of the connection terminal 23 as shown in FIG. As shown in FIG. 4, the terminal plug 30 has a head portion 31 having a diameter larger than that of the small diameter portion 23e of the through hole 23b of the connection terminal 23 and smaller than that of the large diameter portion 23d at the upper end portion and a head portion at the lower end portion. A protrusion 32 having a diameter smaller than 31 and larger than the small diameter part 23e of the through hole 23b, a locking part 33 formed so as to taper from the protrusion 32, and a connection terminal 23 in the middle. A connecting portion 34 having substantially the same diameter as the small diameter portion 23e of the through hole 23b and substantially the same length as the small diameter portion 23e is provided. In the terminal plug 30, the head portion 31 is located on the large diameter portion 23 d side of the through hole 23 b of the connection terminal 23, and the locking portion 33 protrudes from the end portion of the small diameter portion 23 e of the through hole 23 b of the connection terminal 23. As described above, the surface of the head portion 31 of the terminal plug 30 attached to the through hole 23b is provided with a metal plate made of, for example, aluminum metal in order to increase the strength even if the thickness of the head portion 31 is reduced. 35 is provided.

  The metal plate 35 can be fixed to the connection terminal 23 by, for example, laser welding. Since the terminal plug 30 is made of an elastic member, it may fall off due to vibration or the like. However, the through hole 23b is sealed more firmly by the terminal plug 30 by welding and fixing the metal plate 35 to the connection terminal 23. You can stop.

The assembly process of the positive electrode external terminal 16 will be described in the order of processes with reference to FIG. First, the gasket 24 and the connection terminal 23 are arranged on the upper side of the sealing plate 13, and the cylindrical portion 23 a of the connection terminal 23 is inserted into the openings formed in the gasket 24 and the sealing plate 13, respectively. Next, the opening formed in each of the insulating plate 25 and the sealing body tab 26 is inserted into the cylindrical portion 23 a of the connection terminal 23 from the side opposite to the gasket 24. Thereafter, the cylindrical portion 23 of the connection terminal 23
The connection terminal 23, the gasket 24, the sealing plate 13, the insulating plate 25, and the sealing body tab 26 are integrally fixed by crimping the front end portion 23c of a (FIG. 5A).

Next, the periphery of the reversing plate 27 is welded to the peripheral edge of the sealing body tab 26 so as to be completely sealed (FIG. 5B). In this case, as the reversing plate 27, a thin aluminum plate molded so that the lower portion protrudes was used. As a welding method between the sealing body tab 26 and the reversing plate 27, a laser welding method or an ultrasonic welding method can be employed. Thereafter, a gas having a predetermined pressure, for example, an inert gas such as N ₂ gas or dry air, is introduced from the top of the connection terminal 23 into the through hole 23b, and the welded portion between the sealing body tab 26 and the reversing plate 27 is sealed. Check the condition (FIG. 5C). Excludes items that are not completely sealed by this inspection.

  Even if the welded portion between the sealing body tab 26 and the reversing plate 27 is determined to be normal, the current collector holder 28 made of resin is brought into contact with the reversing plate 27, and the current collector holder 28, the insulating plate 25, and the like. Then, the region surrounded by the groove 22a of the current collector 22 and the reverse plate 27 are welded by a laser welding method or an ultrasonic welding method (FIG. 5D). Thereby, the current interruption mechanism 18 of this embodiment is completed.

  Since the welding location between the sealing body tab 26 and the reversing plate 27 may be adversely affected by this welding, a gas of a predetermined pressure is again introduced into the through hole 23b from the top of the connection terminal 23, and the sealing body tab The sealing state of the welded portion between 26 and the reversing plate 27 is inspected (FIG. 5E). By the second inspection, the reliability of the positive external terminal 16 of the present embodiment is greatly improved. However, this second inspection is not necessarily a necessary process, and may be performed as necessary.

  Next, the terminal plug 30 is inserted into the through hole 23b of the connection terminal 23 (FIG. 5F), and the metal plate 35 of the terminal plug 30 is appropriately welded and fixed to the connection terminal 23 by laser welding, for example. The positive electrode external terminal 16 for the positive electrode plate is completed. The positive electrode external terminal 16 for the positive electrode plate may be used in this state, but depending on whether the sealed battery 10 is used alone, in series connection or in parallel connection, etc. A shaped terminal board, external connection terminals, etc. (not shown) may be attached for use.

  Although the configuration of the positive electrode external terminal 16 for the positive electrode plate has been described here, the configuration of the negative electrode external terminal 17 for the negative electrode plate can also be adopted. However, when the configuration including the above-described current interrupting mechanism 18 is employed as the positive electrode external terminal 16 for the positive electrode plate, it is not necessary to employ the current interrupting mechanism for the negative electrode external terminal 17 for the negative electrode plate. As the negative electrode external terminal 17 for the electrode plate, one having a simpler configuration can be adopted.

  In order to complete the sealed battery 10 of the present embodiment, the wound electrode body 12 attached to the positive external terminal 16 is inserted into the outer can 11 and the sealing plate 13 is fitted into the opening of the outer can 11. The fitting portion may be sealed by laser welding, and a predetermined amount of electrolyte may be injected from an electrolyte injection hole (not shown), and then sealed with a sealing material 15 for the electrolyte injection hole. At the time of injection of the electrolytic solution, there is a possibility that the electrolytic solution on the surface of the outer can 11, the sealing plate 13, or the like may be attached. Therefore, it is necessary to clean these surfaces with water. However, in the sealed battery 10 of the present embodiment, since the terminal plug 30 is firmly inserted into the through hole 23b of the connection terminal 23, there is a possibility that electrolyte or cleaning water may enter the through hole 23b of the connection terminal 23. Therefore, the operation of the current interrupt mechanism 18 is not adversely affected.

Further, in the sealed battery 10 of the present embodiment, the space on the side corresponding to the outside of the battery of the current interrupt mechanism 18 is completely sealed, but even if the pressure in the outer can 11 increases due to some cause, Since the gas pressure generated inside the battery becomes extremely large when an abnormality occurs, the pressure in the sealed space on the side corresponding to the outside of the battery of the current interrupt mechanism 18 hardly increases at the same time, and the battery of the current interrupt mechanism 18 There is no problem even if the space on the side corresponding to the outside is sealed.

DESCRIPTION OF SYMBOLS 10 ... Sealed battery 11 ... Exterior can 12 ... Winding electrode body 13 ... Sealing plate 14 ... Gas discharge valve 15 ... Sealing material 15 ... Sealing material of electrolyte injection hole 16 ... Positive electrode external terminal 17 ... Negative electrode external terminal 18 ... Current interrupt mechanism 20 ... Positive electrode core 21 ... Current collector tab 22 ... Current collector 22a ... Groove 23 ... Connection terminal 23a ... Tube portion 23b ... Through hole 23c ... Tip portion 23d ... Large diameter portion 23e ... Small diameter portion 24 ... Gasket 25 Insulating plate 26 ... Sealing body tab 27 ... Reversing plate 28 ... Current collector holder 30 ... Terminal plug 31 ... Head 32 ... Protruding portion 33 ... Locking portion 34 ... Connecting portion 35 ... Metal plate

Claims (5)

An outer can having an opening;
An electrode body having a positive electrode plate and a negative electrode plate housed in the outer can;
A sealing plate for sealing the opening of the outer can;
A connection terminal inserted into a through hole provided in the sealing plate and attached to the sealing plate;
A sealed battery comprising:
The connection terminal and the electrode body are electrically connected,
A current interrupting mechanism for interrupting current corresponding to a rise in pressure inside the outer can is provided between conductive paths that electrically connect the connection terminal and the electrode body,
The connection terminal has a through hole formed in a space corresponding to the outer side of the battery of the current interrupt mechanism.
The through hole of the connection terminal is sealed with a terminal plug including an elastic member and a metal plate,
The said metal plate is a sealed battery arrange | positioned so that the through-hole of the said connection terminal may be plugged up.   The sealed battery according to claim 1, wherein the metal plate is fixed to the connection terminal by welding. The electrode body is a flat wound electrode body around which the positive electrode plate and the negative electrode plate are wound,
The wound electrode body is accommodated in the outer can in a direction transverse to the can axis direction,
The sealed battery according to claim 1, wherein a gasket is disposed between the connection terminal and the sealing plate. An outer can having an opening;
A sealing plate for sealing the opening of the outer can;
An electrode body having a positive electrode plate and a negative electrode plate;
A connection terminal inserted into a through hole provided in the sealing plate and attached to the sealing plate;
A current interruption mechanism that is formed between conductive paths that electrically connect the connection terminal and the electrode body, and that interrupts current in response to a rise in pressure inside the outer can,
The current interruption mechanism includes a sealing body tab and an inversion plate,
The sealing body tab is connected to the battery inner side of the connection terminal, and has an opening on the battery inner side,
The reversing plate seals the opening of the sealing body tab,
The connection terminal has a through hole connected to a space on the side corresponding to the outside of the battery of the current interrupt mechanism inside.
The through hole of the connection terminal is sealed with a terminal plug including an elastic member and a metal plate,
The metal plate is a manufacturing method of a sealed battery arranged so as to close a through hole of the connection terminal,
A first step of attaching the connection terminal to the sealing plate;
A second step of closing the opening of the sealing body tab connected to the connection terminal with a reversing plate, welding the reversing plate to the sealing body tab and sealing the opening of the sealing body tab;
A third step of sending gas through the through hole of the connection terminal to the inside of the sealing body tab and inspecting the sealing state of the weld between the sealing body tab and the reversal plate;
A method for manufacturing a sealed battery, comprising a fourth step of disposing the metal plate so as to close a through hole of the connection terminal. The manufacturing method of the sealed battery of Claim 4 which has the process of welding and fixing the said metal plate and the said connection terminal.